250 rounds of .50 belted in cans would be almost 50 cans...that’s an awful lot of space for something like an F-4 or similar....
--mine being, in response to those who maintain that "one bullet from a .50 cal rifle can bring down a plane", that during WW2 , 12000 rounds of .50BMG were expended per enemy plane shot down---
100 rounds per can = 2 1/2 cans for 250 rnds.